Rough Idle Questions? - Power Hungry Performance Forum

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Rough Idle Questions?

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2004 to 2008 F-150 and Mark-LT
4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs.

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Wed, March 11th, 2009, 10:42 AM

Jackpine Jackpine is offline

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Join Date: Nov 2008

Location: Among Elk, Deer and Javalinas on the Mogollon Rim in Aridzona

Posts: 3,243

I suppose you COULD have a dirty throttle body, but since you have a 2006, this seems a bit soon for that. The only way to tell is to look.

I've never seen the "dip" you describe. And, my idle RPM is in the neighborhood of 600-650.

Could the "stumble" have been the AC coming on?

- Jack

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